Unit / Currency / Timezone — hosted on Cloudflare Workers (HTTP + npm stdio)

What is Unit / Currency / Timezone — hosted on Cloudflare Workers (HTTP + npm stdio)?

A hosted MCP server that provides conversions for 60+ physical units across 10 categories, live currency exchange rates with historical date support, IANA timezone re-anchoring, and ISO date difference calculations. It speaks the Model Context Protocol over HTTP and can be accessed via a thin npm launcher (stdio). Designed for AI agents, it uses Bearer token authentication and offers a free tier.

How to use Unit / Currency / Timezone — hosted on Cloudflare Workers (HTTP + npm stdio)?

Connect any MCP-aware client (Cursor, Claude Desktop, Windsurf, Continue.dev) to the hosted endpoint https://unit-converter-mcp.atlasword.workers.dev/mcp with Authorization: Bearer <api_key>. Alternatively, use the npm launcher npx -y @insnapsprakhar/unit-converter-mcp to run it as a stdio server. Anonymous callers get 100 free calls per month per IP; paid API keys are available via the upgrade page.

Key features of Unit / Currency / Timezone — hosted on Cloudflare Workers (HTTP + npm stdio)

• Convert across 60+ physical units in 10 categories (length, mass, volume, area, time, temperature, energy, speed, data, pressure).
• Live currency conversion with optional historical date support via exchangerate.host.
• Re-anchor ISO datetimes between IANA timezones.
• Compute date differences in ms, seconds, minutes, hours, days, or weeks.
• Tool discovery (tools/list) and invocation (tools/call) over JSON‑RPC 2.0.
• Bearer token authentication with tiered monthly call and rate limits.

Use cases of Unit / Currency / Timezone — hosted on Cloudflare Workers (HTTP + npm stdio)

• An AI assistant converting measurement units inline during a conversation.
• An agent looking up the current exchange rate for a supported currency pair.
• Scheduling a meeting across timezones by re-anchoring a datetime.
• Calculating the number of days between two dates for project planning.
• Educating users about unit relationships using a command palette in an MCP client.

FAQ from Unit / Currency / Timezone — hosted on Cloudflare Workers (HTTP + npm stdio)

How do I get an API key?

Visit https://unit-converter-mcp.atlasword.workers.dev/upgrade?tier=solo (or team/pro), complete the Dodo Payments checkout, and the key will be displayed once on the welcome page. Anonymous users may call the server without a key up to 100 times per month per IP.

What transports does the server support?

The primary transport is HTTP POST to https://unit-converter-mcp.atlasword.workers.dev/mcp. An npm package (@insnapsprakhar/unit-converter-mcp) provides a stdio launcher that shells out to mcp-remote, effectively connecting via HTTP under the hood.

What data sources are used for currency and timezone data?

Live currency rates come from exchangerate.host (free public API). Timezone data is from the IANA Timezone Database (public domain). The server caches responses briefly and stays within each upstream’s free-tier ToS.

What is the free tier and how does pricing work?

The free tier offers 100 calls per month and a 10‑call/minute rate limit. Paid tiers (Solo $5/mo, Team $15/mo, Pro $39/mo) provide higher monthly call limits and rate limits, with Team and Pro adding team‑member sub‑keys. Billing is handled via Dodo Payments.

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